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JEE Main & Advanced Physics Magnetism Question Bank Magnetic Equipments

  • question_answer
    Two short magnets having magnetic moments in the ratio 27 : 8, when placed on opposite sides of a deflection magnetometer, produce no deflection. If the distance of the weaker magnet is 0.12 m from the centre of deflection magnetometer, the distance of the stronger magnet from the centre is                                                [EAMCET (Med.) 2000]

    A)            0.06 m                                     

    B)            0.08 m

    C)            0.12 m                                     

    D)            0.18 m

    Correct Answer: D

    Solution :

               \[\frac{{{M}_{1}}}{{{M}_{2}}}={{\left( \frac{{{d}_{1}}}{{{d}_{2}}} \right)}^{3}}\Rightarrow \frac{27}{8}={{\left( \frac{{{d}_{1}}}{0.12} \right)}^{3}}\] \[\Rightarrow \frac{3}{2}=\frac{{{d}_{1}}}{0.12}\Rightarrow 0.18\ m\]


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